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<title>mddc-add-block-sym</title>
<meta name="Description" content="Reference of the mddc-add-block-sym program." />
<meta name="Keywords" content="mdevd-conf dev blockdev symlink disk" />
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<p>
<a href="//0x53.net/software/mdevd-conf">mdevd-conf</a>
<br />
<a href="//0x53.net/software">Software</a>
<br />
<a href="//0x53.net">0x53.net</a>
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<h1>The mddc-add-block-sym program</h1>
<p>
mddc-add-block-sym is a helper script to create
symlinks at <code>/dev/disk/by-*</code>.
</p>
<h2>Interface</h2>
<pre> mddc-add-block-sym</pre>
<ul>
<li>
mddc-add-block-sym takes no arguments.
</li>
<li>
It reads the <code>MDEV</code> environment variable,
if it is empty it exits 100.
</li>
<li>
It creates PARTUUID symlinks at <code>/dev/disk/by-partuuid/</code>,
using <code>/sys/block</code> to get the PARTUUID.
</li>
<li>
It creates DISKSEQ symlinks at <code>/dev/disk/by-diskseq/</code>,
using <code>/sys/block</code> to get the DISKSEQ.
</li>
<li>
It creates hardware ID symlinks at <code>/dev/disk/by-id/</code>,
using <code>/sys/block</code> to get the ID.
</li>
<li>
It checks whether it can execute <code>blkid</code>.
If this is the case:
</li>
<ul>
<li>
It creates UUID symlinks at <code>/dev/disk/by-uuid/</code>,
using <code>blkid</code> to get the UUID.
</li>
<li>
It creates LABEL symlinks at <code>/dev/disk/by-label/</code>,
using <code>blkid</code> to get the LABEL.
</li>
</ul>
</ul>
<h2>Exit codes</h2>
<ul>
<li>
100 if a critical environment variable is missing.
</li>
<li>
Since mddc-add-block-sym is an
<a href="https://skarnet.org/software/execline/">execline</a>
script, it exits with an approximation
of employed program that failed.
</li>
<li>
mddc-add-block-sym mostly uses
<a href="https://skarnet.org/software/execline/">execline</a>
software, the exit behaviour of which can be looked up on
their respective pages.
</li>
<li>
See also:
<a href="https://skarnet.org/software/execline/exitcodes.html">execline exit code handling</a>.
</li>
</ul>
<h2>Options</h2>
<ul>
<li>
There are no options to mddc-add-block-sym.
</li>
</ul>
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